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You can use a dual band antenna if your running a base station, but if you run a repeater, you should consider separate antennas, as you would have to be very careful. I don't do much VHF, but I do have a workman UV200 in storage. for the repeater we have also run the Comet 712. These fiber glass antennas flex a lot in gale force winds, need additional sealant or heat shrink around middle. If you are single story, get yourself a 20' section of pole 2" pole and a house bracket, some even have the ability to tilt out for service. you can mount another 10' to that for about 30' without spending too much.

Thanks mcallahan, I figured that would be the case, but thought I'd ask. I want to use the 1/4 wave since it will clear brush and trees better.

I have nothing against flat packs in the right environment. not something you want to use in an RF dense site but as a stand alone in the middle of nowhere your probably good. in our world at such low power a flat pack will be fine at 1.2-1.5 db insertion loss and 75dB isolation between the ports for $$ as oppose to a .5dB insertion loss and 100+dB of isolation for a TX-RX $$$$$ in the real world a 40W input will give you 28-32W out if tuned properly. now the $$$$$ unit will give you 36W. it all depends on your budget, location and expectations of the system. as to RX sensitivity that I find radio dependent, some are good some out right suck. I personally like Kenwood as their receivers will typically do .25-.27uV out of the box. I have seen them go as low as .18-20uV after a tune. just my thoughts.